Metastability and Avalanches in a Nonequilibrium Ferromagnetic System

Details Metastability and Avalanches in a Nonequilibrium Ferromagnetic System Metastability and Avalanches in a Nonequilibrium Ferromagnetic System

2003-02-12

arxiv.org/abs/cond-mat/0302241v1

Physics

Condensed Matter

Statistical Mechanics

6 pages, 4 figures, to be published in 2002 Granada Seminar Proceedings

Scientific paper

10.1063/1.1571303

We present preliminary results on the metastable behavior of a nonequilibrium ferromagnetic system. The metastable state mean lifetime is a non-monotonous function of temperature; it shows a maximum at certain non-zero temperature which depends on the strengh of the nonequilibrium perturbation. This is in contrast with the equilibrium case in which lifetime increases monotonously as the temperature is decreasesed. We also report on avalanches during the decay from the metastable state. Assuming both free boundaries and nonequilibrium impurities, the avalanches exhibit power-law size and lifetime distributions. Such scale free behavior is very sensible. The chances are that our observations may be observable in real (i.e. impure) ferromagnetic nanoparticles.

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